Piled vacuum evaporating apparatus.



No. 764,393. PATENTED JULY 5, 1904. T. SUZUKI.

PILED VACUUM EVAPORATING APPARATUS. APPLiOATION FILED MAR.10. 1004.

no MODEL. 3 SHEETS-SHEET 1.

No. 764,393. PATENTED JULY 5, 1904. 7 I T. SUZUKI.

PILED VACUUM EVAPORATING APPARATUS.

' APPLICATION FILED MAR 10 1904. N0 MODEL. 3 SHEETS-SHEET 2.

MM 13 esfieg: live 1 fife r7794,

PATENTED JULY 5, 1904.

T. SUZUKI. Y PILBD VACUUM EVAPORATING APPARATUS.

APPLICATION FILED MAR. 10, 1904.

3 SHEETS-SHEBT 3.

' N0 MODEL.

UNITED I STATES Patented July 5, 1904.

PATENT OFFICE.

TOZABURO SUZUKI, or SUNAMURA, JAPAN.

PlL ED VACUUM EVAPORATING APPARATUS.

SPECIFICATION forming part'of Letters Patent N0. T642393, dated July 5,1904.

Application filed March 10, 1904.-

To all whom it may concern.-

. Be it known that I, TOZABURO SUZUKI, asub ject of the Emperor ofJapan, residing at No. 401 J ibeishinden, Sunamura, in the county ofMinami-Katsushika, in the Province of Tokio, Japan, have inventedcertain new and'useful Improvements in Piled Vacuum EvaporatingApparatus, of which the following is a specification.

The invention relates to evaporating apparatus consisting of two sets ofvacuum evapcrating-pans placed side by side and havingevaporating-surfaces almost as wide as the heating-surfaces and inuniformily distributing the liquid on the heating-surfaces {so as tofacilitate and to make complete the process of evaporating by causingthe liquid gradually andautomatically to drop; second,lin revolving thedistributing-disk so as to cause the liquid to spread uniformly .overthe heating-surfaces and to makethe evaporating action complete, theconstruction of the said distributing-disk being also made very simple;third, in placing one above the other thelayers of theevaporating-surfaces to minimize the spaces.- and. toasimplify theconstruction and repair and the addition or diminution of the number ofthe layers; fourth, in preventingthe boiling over of the liquid, and,fifth, in making the evaporation of the liquid complete by utilizing theheat to its fullest extent. f

In the accompanying drawings, Figure 1 is afront elevation of the firstevaporating-pan. Fig. 2-is a longitudinal section of the secondevaporating-pan. Fig. 3 is a plan view of the apparatus connecting thefirst and second evaporatingpans. Fig.4 is a transverse section uponlineIVIV of Fig; 2. Fig. 5 is a transverse'section upon line V V of Fig. 2,showingthe arrangement of the coils.

itLikenumerals of reference refer to same or charge pipe or draw-01fpipe 3.

Serial 110,197,628. (No model.) 1"

similar parts throughout the specification and drawings. I

The first and second vacuum evaporatingpans being entirely identical intheir interior construction, the description of one will suffice for thedescription of the other, and-numorals upon one may be taken asreference characters for the other.

The evaporating-pan consists of base 1, a

number of superposed drums 11, upper drum 7 and co vcr 21, hermeticallysecured one above the other in due order. The upper drum 7 is providedwith Vacuum-gage 12 and thermometer 13 in order to determine the degreeof vacuity and temperature, while each drum 1 1 is provided withpeep-window 14, of glass plate, on each opposite side in order to permitexamination of the icondition of the interior. One of the drums has ahole bored to receive the air-pipe 15, providedwith an air-cock for thepurpose of admitting air into the pan,

While the base 1 and the lowest drum are provided with awater-gageconsisting of glass pipe 43 and 44, connected by cocks 41 42.Through the center of the base rises short verticalshaft 2, hermeticallypacked by a suitable gland, and alongside said shaft is a liquid-dis-The cover 21 hasthe outlet-port 22 in order to discharge air and vaporfrom the pan, while cap or baifie23 is suspended from the cover toprevent the liquid from entering theoutlet-port withcthe vapor. I l

The feed-pipe 8 is connected with the upper drum 7 and is attached tothe annular liquid-discharge pipe or sprinkler 9, having a number ofperforations. The drums 11 are provided with flanges '47 to admit theirbeing placed one uponthe other. The drums have flat bottom 17 in theirinterior, which in the center of each drum are provided with an annularupwardly-projected flange, so that they Each receiver 17 is providedwith discharge-nipple and cock 19,112LV".

may form receivers.

ing handle 18 outside the pan, so as to regulate the quantity of theflowing liquids. Overflow-pipes 20 rise to a distance from the bottom tokeep the body of the liquid constant and of suitable depth thereon, theoverflow going to a perforated plate or disk beneath.

Receivers in the drums 11 are provided with a number of annular coils26, which, as shown in Fig. ,5, are connected at one end withsteamchamber 27 and at the other with exhaustchamber 28. These chamberssend their respective branches 45 46 outside of the pan in order toadmit steam into the coils 26 and exhaust it therefrom. As these coilsserve the purpose of giving heat to the liquid, they maybe replaced byother multitubular waterheater contrivances.

The upper part of the pan is provided with a rotary distributing plateor disk 30. This distributing-disk 30 is a flat annular vessel havinginner and outer flanges 31 32 and is penetrated by a number ofconducting-perforations 33, passing directly over the convolutions ofthe coils 36. These perforations have slightly-upstanding flanges inorder to cause the liquid to retain more or less depth in thedistributing-disk 39, the overflow going over these flanges down to thenext layer or receiver. In the floor of the distributing plates or disks30 smaller perforations 34, Fig. 4, than the conducting-perforations 33are provided in order to cause the liquid to continually drip. Theperforations 34 being very small, the liquid that'continually flows fromabove cannot all escape through them, but settles in the disk until itoverflows the flanges of the conducting-perforations 33 and is uniformlydelivered to the receiver beneath. When the supply of liquid from aboveis stopped, all the remaining liquid in the disk drips through the smallperforations 34 till -the-disks are exhausted in a short time. The innerupstanding. annular edge 31 of the'distributing-disk 30 is provided witharms which are connected with vertical supports or shaftsections 36,provided in the center of the vacuum-pan. These supports are hollow andare perforated all around with steam-conducting perforations 38. Each ofthese supports is placed on the vertical, shaft 2 one above the other,so as to make them continuous and capable of being revolved by means ofdowels 37, connecting the series. A short shaft 24 is fixed to thesupport 36 of the uppermost distributing-disk 30 and is journaled in thebearing-bar 10, provided in the upper drum of the vacuum-pan 7 In thisinvention two vacuumpans constructed as in the foregoing paragraphs areinstalled side .by side. First vacuum -.pan draws in steam from thesteam-pipe 4, provided with pressure-gage 6, and exhausts it through theexhaust-pipe 5 after it passes first through the branch pipes 45 tocoils 26 and then through the branch pipes 46 to exhaust-pipe 5, the endof which is connected with condenser and air-pump by means ofsteam-trap. The air-outlet port 22 of the first vacuum-pan is connectedwith the conducting-pipe 29. The vapor produced in the first pan is ledto exhaust-pipe 39 from branch pipes 45 after first reaching coils 26from conducting-pipe 29 audbranch pipes 45. The extreme end of theexhaust-pipe is joined by the stop-valve 40 with the exhaust-pipe 25 ofthe second pan and is connected with condenser and air-pump. The outlet22 of the second pan is connected with condenser and air-pump viaexhaust-pipe 25. The discharging-pipe 3 of the first pan is connectedwith the feeding-pipe 8 via regulating-valve 108,

I while the discharge-pipe 3 of the second pan is connected withexhaust-pump.

Steam-conducting pipe 4, steam-exhausting pipe 5, conducting anddischarging pipes 25 and 39 are of the same length or twice the lengthof the drums with which they are connected, and, as in the case of thedrums, they can easily be increased or decreased in length or detachedfor repair.

Inorderto evaporate liquid by this apparatus, the condenser and air-pumpat the ends of exhaust-pipes 25 39 are set in action, by which means theair contained inthe first and second pans is exhausted. Then theregulating-valve 108 of the feeding-pipe 8 is opened to send a suitableamount of liquid to the first pan. Steam of required volume is also sentto the same pan by opening the regulatingvalve 104 of the steam-pipe toheat the coils 26, and gentle rotation is then given to the verticalshaft 2." The liquid passes down through the small perforations of thedistributing-pipe 9 to the upper distribu tingdisk 30 and accumulatesthere until it overflows' the upper edge of the liquid-conductingperforations 33 and drops down equally and uniformly on the differentparts of coils 26, which generate suflicient evaporating action, andinto the receiver beneath. The vapor ascends through thespace betweenthe inner annular flange 16 of the receiver and the space between theinner edge 31 of the distributing-pan. By opening the cook 19 of thereceiver by means of the handle 18 from outside the I pan the liquid inthe receiver passes down through the cook 19 into thedistributing-diskof the next layer. By these successive operations theliquid finally settles on the base 1, and the amount of settled liquidcan be examined by glass tube 43 by opening cocks 41 42, provided to thewater-gage.

In order to ascertain the density of liquid passing through the firstpan, the cock 19 of the lower layer is closed, while the cock 42 is soadjusted as to be partly closed. The liquid then fills in thewater-gage. By opening the cover 44 the pycnometer is inserted in thewater-gage or some quantity of the liquid is taken out, and the densitycan easily be ascertained in that way. After the density of the liquidhas been ascertained the cover is closed and the cooks 41 42 are opened.

The vapor produced in the first pan ascends by passing through thespaces between flange 16 of thereceiver and between inner edge3l IIO ofthe distributin gwdisk 30, through the inner chamber of its support 36and enters the conducting-pipe29 by wayof the outlet 22. As

a this vapor passes through the coils 26 of the second pan and joins,through exhaust-pipe 39, to the exhaust-pipe 25 of the second pan,thence to be conducted to the condenser,

it therefore by the adjustment of valves 40 the vacuity of the first pancan be made lower in degree than that of thesecond pan." According toactual experiment the proper relative vacuity of the first pan is lessthan fifteen inches, while the second is not less than twenty. As therelative'degree of vacuityof the first and second pans is different,therefore the liquid settled on the base of the first pan canautomatically be sent in suitable quantity by the proper adjustment ofthe regulating-valve 208 from discharging-pipe 3 to the second pan andthrough the feeding-pipe of. the second pan. The said liquid in thesecond pan having been subjected to the same action as when it was inthe first pan, it settles on the base 1 and is then discharged by pumpthrough the pipe 3. When, according to the kind of liquid to be treatedand convenience, distributing-disk 30 is not to be rotated, therevolving motion of the vertical shaft 2 is stopped and the cooks 19 ofthe receivers closed. Then the liquid first settling in the chamberoverflows the up per edge of pipe 20 and passes down to be subjected inthe receiver to the action of the heat generating from the whole partsof the coils and evaporating from the Whole surface of the chamber.Sometimes the distributingdisk 30 may be dispensed with.

The present invention being devised and put in operation asaforementioned, the evaporation of liquid is exceedingly rapid, for notonly does the entire surface of the coils 26 constitute heating-surface,and the evaporatingsurface therefore practically equal that of theheating-surface, but the liquid is also constantly and uniformly spreadover the coils 26 and is made to fall, subjecting automatically and inregular succession to the same operation one portion after another. Thedistributing-disk is made to revolve constantly, so as to cause theliquid to spread uniformly and in different positions overtheheating-surface of the coils 26. This will make the evaporatingaction complete. The construction of the distributing-disks 30 is suchas to admit of their being placed on the vertical shaft one above theother in a series. Therefore their installation is simple, andno"difiicultyis experienced in bringing about the rotary motion andcausing the vapor to ascend. The drums 11,

steam conducting pipe, steam exhausting pipe, 620., being constructed insections, so that they may be putone above the other, it is possible toadd new layers in the minimum space and to produce a maximum evaporatingaction. Besides they also possess the advantage of simplicity ofconstruction andinstal -be mixed and discharged Witlithe vapor.

lation, as in the case of the distributing-disks,

and are capable of readily adding to or diminreceiving repairs. 5 p

In an ordinary vacuurn-pan the liquid is agitated and bubbled over as aresult of boiling, and this priming impedes the action of evaporation,while more or less liquid is liable to In order to prevent thisinconvenience, several contrivances are made in ordinary cases; but inthe present invention, the liquid being confined to the evaporator, thistrouble is re moved and the evaporation can be safely and perfectlymade.

ishing the number of layers and of quickly condenser for the first pan,the utilization of the heat is complete.

Having thus fully described my-invcntion, what I claim as new, anddesire to secure'by Letters Patent, is- V f 1. The combination, in avacuum evaporating apparatus, of a receiver, heating mechanism therein,arevolving distributing-disk thereabove, and means for applying liquidto said disk.

2. The combination in a vacuum eva orat- 7 ing apparatus, of a series ofI'GCGlVGIS, heattributing disks having overflows arranged above each ofthe convolutions of sald coils,

and means for supplying liquid to the uppermost of said disks.

5. In a vacuum evaporating apparatus, the combination with rotarydlstributing-disks,

one above another, of a shaft for rotating them,

and supportsections, one to each disk, mount ed upon and detachablysecured to said shaft and to each other. I

6. In a vacuum evaporating apparatus, the

combination with rotary distributi1ig-disks,

one above another, of a shaft for rotating them, and tubularsupport-sections, one to 'eaeh disk, having perforated walls and mountedupon and detachably secured to said sli'aft and to each other. 7. In avacuum evap'oratlng apparatus, the

combination of a seriesof detachable drums placed one above another, acentrally apertured receiver carried by each drum, aheating-coil in eachreceiver surrounding the cen tral apcrture,a central verticalshaft, aseries of superposed support-sections mounted rior of the casing, aheating-coil in each receiver, a rotary distributing-disk above eachreceiver, receiving the overflow of the receiver above and havingoverflows delivering to the heating coils and receiver beneath, and aliquid-spreader, delivering liquid to the topmost disk.

9. In a vacuum evaporating apparatus, the combination of two Vacuum-pansarranged side by side, each having a series of receivers, andheating-coils, therein, an alternating series of rotarydistributing-disks receiving from and delivering to' said receivers,drawoff pipes, liquid-supply pipes, and overhead exhaust-pipes, withconnecting piping and valves whereby the heated exhaust vapors and gasesof the first are directed into the heatingcoils of the second and theliquid products of the first led to the supply-pipe and spreaderthereof. 7 p

10. The rotary distributer constructed with flangedoverflow-perforations and withsmaller drip-perforations through itsflow.

In testimony whereof I aifix my signature in presence of two witnesses.

TOZABURO SUZUKI. Witnesses:

I. V. LILLIE, K. W. Snno.

